Therefore, I'm assuming there's a spread between your previous percentage contributed to today's contribution percentage. 

If you dont mind sharing numbers....what would be the spread you would want to see on something like that and why?

first trip will cost you the first years cash flow.annual trips will cost you about 50% of your cash flow.. so important to pick a place and scale there so your trip expenses if you being honest with your self is spread over many doors..  

Beyond spreading risk, the leverage increases the other 3 avenues of REI profit (appreciation, depreciation, pay-down) exponentially. 

Depending on your potential profit margin spread, be careful where you get your funds from.

I especially wouldn't buy out-of-state properties in snow states like Michigan due to the extra repairs even if the spread may seem better than San Antonio.

Most CAPEX, such as roof, furnace, major repair (kitchen, bath...) should be proactively paid for through the initial financing, and thus paid for by the tenant (rent) at a severely discounted price...since it will be spread over 30 years.5 - Read Rich Dad Poor Dad. 

She was behind in rent, $2500 total that I will never get back, always making excuses on her rent, and spread bed bugs in her unit and the bottom one.

The duplexes and quads often offer great cashflow with less risk because the rent is spread across several renters.

@Mikael Winkler Aside from different thresholds from different people mentioned above by Joseph, much of the reason for this occurrence you stated in your post is the fact that our current market conditions in many areas of the country are highly competitive and finding the easier lipstick deals are few and far between so investors must adjust their strategy to include heavier rehabs and perhaps additions to create enough spread in the deal.